AN3392 datasheet(42/57 Pages) STMICROELECTRONICS

Part #	AN3392

Description	The SPV1020 is a monolithic DC-DC boost converter designed

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SPV1020 parallel and series connection

AN3392

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Doc ID 018749 Rev 1

Appendix B

SPV1020 parallel and series connection

The output pins of the SPV1020s can be connected both in parallel and in series. In both

cases the output power (Pout) depends on light irradiation of each panel (Pin), application

efficiency, and on the specific constraint of the selected topology.

The objective of this section is to explain how output power is impacted by the selected

topology.

Examples with three PV panels are presented, but the result can be extended to a larger

number of PV panels.

In the case of the SPV1020 being ON (I.e. there is enough light irradiation so that Vin =

6.5 V):

Equation 29

In the case of the SPV1020 being OFF, the system efficiency depends on the drop of the

bypass diode D1 (according to the schematic in Figure 24):

Equation 30

Finally, in the case of the panel being completely shaded:

Equation 31

Poutx

Pinx x

1..3

[]

Poutx

bpP

inx x

1..3

[]

Poutx

AN3392 Datasheet(PDF) 42 Page - STMicroelectronics